Incandescent lamp.



'MARCELLO voN P anar, or WILMERSDORF, eE'aMAnY, Assre oR. T smear.

ELEGTBIQ, COMPANY, A CORPORATION OF NEW YORK.

moANnEscENr-mm.

1,oe9,721. No Drawing.

To all whom it cont-era Be it known that I, MARonLLovoN PI R'A NI, acitizen of the Italian Kingdom, residing at Wilmersdorf,.nearBerlin'j-Germany, haveinvented certain new andfiuseful- Improve meritsin Incandescent Lamps, Of'WhlCh the following is a specification;

The object of my invent-ionis to prolong the life and increase theefiiciencyioftungsten or'oth'er metallic filament lamps; For thispurpose it has heretoforebeen proposed to operate the filament inahalogenous atmosphere. In practice, however, it IS a more or less"difficult-task to liberate the, halogen gas or vapor in just theprope'ramount for.

the best operation ofthe lamp I have dis- J covered'th'at. when certainmetallic halogen in the bulb'. IQhave, found that chlorid of compoundsare subjected to theac'ti-onofthe light and" heat action-0f thdfilanientthey are'decomposed and the halogenlib'erated silver is "asuitable-compound forthisipur 1 pose.

'- I able metal and ofisuitable design; .For'best -bulb,"a tungstenfilament mounted therein, 85 'iron orfsimilarvmetals are particularlysat isfactor'y for this purpose, arid a satisfactory;

V'Benefical results may be obtained by the use of the hal gencOmpOundalonev or in combination with achemically active metal used as acarrierfor' the compound. ridof silver, for example, is placed in the 'bulbinsuch manner that it is acted .on by the light and heat actionof thefilament and may be located atany suitable distance from the'filamentIts location determines the rapidity with which the gas is liberated andthis may be-determined by trial for each size or class of lamps. Furtherthe" com; pound ,may be mounted on ajcarrier of suit'-' results I havefound, that carriers of nickel,

arrangement of the carrier is in .theform of a small gauze or network't-l have 'found also that a particularly good combination fortungstenfilament lampsfis, the use of chlorid of silver'on a carrier o-fnickel,'The compound-may be;.melted onto thecarrier and the carrierthe'compolmd thereon f Specification of Letterslatent. I Applicationfiled November 23, 1912 Serial N 0. 733,075.

ohiolocation with respect to the filament. The

carriermay be mounted on'the central fila- 5o ment supporting stem-.' Insome cases it may be. folded about said stem. It may be that the carrierwhich is in. intimate contact.

with the compound and/is therefore 'subected'-to "substantiallythe sameconditions as the-compound regulates" the amount of -gaso-r=vaporliberated whereby more uniq form liberation and consequently betterresultsare obtained than if an indifferent carrier were used, or itmaybethat the carrierhas some other" chemical relation to, or

efiect' 011,-the behavior of the compound or the gasor 'vaporliberatedtherefrom. It isto be understood, however, that good re sultsmay beob'tained by the use of a'halogen compound of silver mounted-on achemi "c'ally indifferent carrier;

What claim as. new anddesire to secure by Letters Patent of the UnitedStates, is,:'

1. An incandescent lamp comprising a bulb, a tungsten 'filamentmountedtherein,

and a'halogen compound of silver in said bulb in efi'ective relation tosaid filament. 2. An' incandescent lamp comprising; a

bulb, a tungsten filament mounted therein, I -a.halogen compound ofsilver insaid bulh in proximity to said filament, and a carrier for said'compounda p 3, An incandescentflamp-comprising .a

bulb, 'a tungsten filament mounted therein, I

chlorid of silver in said bulb in proximity to said filament, and ametallic carrier for said chlorid. I

4. Anincandescent lamp comprising. a

chlorid 'of silverin said bulb, in operative nickel for said chlorid. I

[relation to said filament, and a Ecarrierof In'witnes swhereof, Ihavefhereunto set, .my' hand thisfifth day'of Novemberl'i- 1912; '90- aMARCELLO VON PIR NI. Witnessesi i Y J v HENRY HABPER, 1 I WOLDEMARHAUPT- Patented June 9, 1914.

is then mounted in the lamp-in a suitable f,

